If scientific evidence guides our health decisions, we will look back at the vitamin craze of the last few decades with disbelief. Indiscriminate use is, in most cases, probably useless and potentially harmful. We are collectively throwing away billions of dollars into supplements, chasing the idea of benefits that have never materialized. Multivitamins are marketed with a veneer of science but that...

Dr. Andrew Weil has teamed with Innate Response Formulas to develop a series of seminars and a line of products for “seasonally appropriate integrative strategies.” Seasonal Therapeutics is a system for adjusting diet supplement recommendations according to the season of the year. To kick off the program, a one-day seminar was presented by Weil’s colleague Tierona Low Dog in Boston on August...

I’ll start with a confession. I used to do something irrational. I used to take a daily multivitamin, not because I thought there was good scientific evidence to support the practice, but for psychotherapy. I tried to eat a healthy diet and worried about it. By taking a pill, I could stop worrying. Then I found out that higher intake of vitamin...